Vat dye.



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ALEXANDER HAMBURGER, OF ELBERFELD, GERMANY, ASSIGNOR TO FARBENTA- BRIKEN VOBM. FRIEDR. BAYER 8; (30., 0F ELBERFELD, GERMANY, A CORIORATIOK 0F GERMANY.

Specification of Letters Patent.

var are.

Patented Apr. 22, 1913.

Application filed Apri126, 1912. Serial No. 693,444.

To all who-m '1' t may concern Be it known that I, ALEXANDER HAMBUR- onn, doctor of hilosophy, chemist, citizen of the German mpire, residing at Elberfeld, Germany, have invented new and useful Improvements in New Vat Dye, of which the following is a specification.

My invention relates to the manufacture and production of new anthraquinone derivatives which are valuable vat dyestuffs.

The process for the production of the new compounds which are most probably coerthionium compounds consists in treating dianthraquinonylthioet-hers with condensing agents. The simplest of these compounds, that obtainable from the unsubstituted ether, has probably the following graphically represented formula:

temperature until the coloration brown in the beginning has turned blue. When the coloration does no'longer change the sulfate of the new product is precipitated by the addition of sulfuric acid of 60 B. It is filtered off and washed with water. The new compound is a reddish-yellow crystalline powder soluble in monohydrated sulfuric acid with a pure blue coloration; It is insoluble in q'uinolin and yields a reddishbrown hydrosulfite vat from which cotton is dyed in yellow fastshades.

The product obtained from the dry-dibenzoyldiamino-derivative dyes cotton in fast brown shades.

When the reaction is carried out at a higher temperature one or two benzoyl groups are split off. From the 5.5-diheuzoyldiamino 1.1-dianthraquinonylthioether a product is thus obtained which dyes cotton in brown-red shades. That obtained. from lxy-dibenzoyldiamino 'derivative dyes reddish-blue.

Other of the above mentioned parent materials e. g. monosubstituted alpha-alphaor alpha-beta-thioethers or the ethers themselves can be used.

I claim The herein described new derivatives of thioethers of the anthraquinone series being most probably coerthionium, compounds of the anthracene series, which are after being dried and pulverized from yellow to black powders soluble in concentrated sulfuric acid generally with from a brown to red to blue to green coloration; dyeing cotton from the vat from yellow to brown to violet to green shades, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

ALEXANDER HAMBURGER.

lVitnesses HELEN NUFER, ALBERT NUFER.

Goples of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

' Washington, D. G. 

